In 1938, he organised a hunt for a leopard reported to be roaming the depot at Bakloh, only to find himself facing a full-grown tiger (which killed one of the Gurkhas acting as beaters). He later commented that whatever rank and decorations he was awarded, he was always known to the Gurkhas as "The Sahib who shot the Bakloh tiger".[1]

In early 1939, he was appointed the Adjutant of the 2nd battalion of the 4th Gurkhas. During the Second World War his battalion was sent to Basra in Iraq, during the brief Anglo-Iraqi War. Masters subsequently served in Iraq, Syria, and Persia with the battalion, before being briefly seconded as a staff officer in a Line of Communications HQ. In early 1942, he attended the Indian Army's Staff College at Quetta. Here he met the wife of a fellow officer and they began an affair. Even though they later married, there was something of a scandal at the time.

In May, the brigade was ordered to hold a position code-named ‘Blackpool’ near Mogaung in northern Burma. The isolated position was attacked with great intensity for seventeen days and eventually the brigade was forced to withdraw. Masters felt obliged to order the medical orderlies to shoot 19 of his own men, casualties who had no hope of recovery or rescue. Masters later wrote about these events in the second volume of his autobiography, The Road Past Mandalay.

After briefly commanding the 3rd battalion of his regiment, Masters subsequently became GSO1 (the Chief of Staff) of Indian 19th Infantry Division, which was heavily involved in the later stages of the Burma Campaign, until the end of the war. On January 17, 1946,[2] he was awarded an OBE for his service in Burma. After a spell as a staff officer in GHQ India in Delhi, he then served as an instructor at the British Army Staff College, Camberley. He left the army after this posting, and moved to the United States, where he attempted to set up a business promoting walking tours in the Himalayas, one of his hobbies.[3] The business was not a success and, to make ends meet, he decided to write of his experiences in the army. When his novels proved popular, he became a full-time writer.

In later life, Masters and his wife Barbara moved to Santa Fe, New Mexico, USA. He died in 1983 from complications following heart surgery. His family and friends scattered his ashes from an aeroplane over the mountain trails he loved to hike. General Sir Michael Rose, the former UN commander in Bosnia, is a stepson of Masters.

John Masters: a regimented life by John Clay was published by Michael Joseph in 1992. Now out of print, it is a sympathetic but not uncritical biography. According to Clay, Masters possessed a strong and sometimes domineering personality, and could be impatient with weakness or incompetence. He could also be extremely warmhearted and generous. His outgoing and boisterous personality flourished during his long residence in the United States. Masters was impatient with the literary establishment, which faulted his Indian novels as unsympathetic to Indians, and he was impatient with editors who wanted to remove the rough edges from his characters. Masters strove for accuracy and realism, resenting it when people mistook his characters' views as his own. He was extremely hard-working and meticulously well-organized, both as a soldier and a novelist. Clay speculates that Masters may have been driven to achieve by rumours that his family was not "pure" English, but Anglo-Indian or Eurasian. In 1962 Masters learned what he had apparently long suspected, that he did indeed have a distant Indian ancestor.

Clay's biography provides details that Masters omitted from the three volumes of autobiography he wrote: Bugles and a Tiger (1956); Road Past Mandalay (1961); and Pilgrim Son (1971). They are nevertheless extremely revealing. Bugles and a Tiger, details Masters's time at Sandhurst and service on India's northwest frontier on the eve of the Second World War. Road Past Mandalay deals mostly with the Burma campaign in the War, while Pilgrim Son chronicles his career as a writer.

Apart from the autobiographical works mentioned above, Masters is also known for his historical novels set in India. Seven of these portray members of successive generations of the Savage family serving in the British and Indian Armies in India, in an attempt to trace the history of the British in India through the life of one family. In chronological order of events (but not in order of publication) these novels are:

Coromandel! (1955) A 17th-century English lad runs away to sea and ends up in India.

The Ravi Lancers (1972) An offshoot of the series, set in the First World War, with one of the protagonists related to the Savages but having a different name.

One of Masters's last Indian novels, The Venus of Konpara, is notable for the fact that its principal characters are Indians. The Savage family play no role in the storyline, though it is hinted that a minor unidentified character is a family member. It is set in the nineteenth century during the British Raj, but explores the history of Indo-Aryan and Dravidian identities in the country.

Unsurprisingly, considering the subject, Masters's works are not without their critics, many of whom simply reflect their own thinking about British imperialism rather than addressing the literary quality of Masters' work. Those who are hostile to the Empire criticise his work as revisionist—without specifying what is being "revised"—or as uncritical of the Empire. Typical are the observations of Ronald Brydon: "For us, the saga of the Savages, heroes and conquistadors of the Raj, was a political pornography in which we savoured the illicit sensualities of imperialism."[4]

Others have detected a greater sophistication in Masters's dealings with the British Empire.[5] Both Nightrunners of Bengal and The Ravi Lancers contain sympathetic portrayals of Indian nationalists and portray irreconcilable tensions between British and Indian characters that mirror the conflicts inherent in British India in a manner comparable to E. M. Forster's A Passage to India. The descendant of the hero of the former novel (who is in practice manifestly the same character) experiences the partition of India with a resigned detachment and later undergoes a deep personal crisis which ends with his staying on in independent India rather than returning to Britain. One Indian novelist (Khushwant Singh) remarked that while Kipling understood India, John Masters understood Indians.[6]

Masters's trilogy of Now God Be Thanked, Heart of War, and In The Green Of The Spring has some claim to be considered his magnum opus, covering the changes to various segments of British society wrought by the upheavals of the First World War.[8] Masters's book Man of War appears to have been the first of a planned trilogy on the Second World War; however, the author died before any other connected books were published.

In the 1950s and 1960s the books of Masters sold in large numbers, particularly Bhowani Junction, which was also translated into various other languages. Some of his works are now out of print.